adapt_grid integration order is now the same as in DG operator

dune/dorie/interface/adaptivity.hh

@@ -58,6 +58,9 @@ private:
 	const float adaptivityThreshold; //!< Global error threshold below which no refinement is applied
 	const int verbose; //!< output verbosity of this object
 
+	const int intorderadd = 2;
+	const int quadrature_factor = 2;
+
 public:
 
 	/// Initialize members from config file parameters.
@@ -174,7 +177,11 @@ public:
 			t_mark = timer3.elapsed();
 			timer3.reset();
 
-			Dune::PDELab::adapt_grid(grid, gfs, uold, unew, 2*order);
+			// calculate integration order like in DG operator
+			const int intorder = intorderadd + quadrature_factor * order;
+
+			// adapt the grid
+			Dune::PDELab::adapt_grid(grid, gfs, uold, unew, intorder);
 
 			t_adapt = timer3.elapsed();
 			timer3.reset();